We look at existing tools that can help you plan—and new investment options that can help you get there from here.

How do 78 million baby boomers turn their nest eggs into income that can last as long as they do?

Everyone in the U.S. retirement landscape—from federal regulators to 401(k) administrators and employers to workers themselves—is struggling to find a good answer. With $11 trillion at stake in tax-deferred retirement accounts, the financial-services industry also is keenly interested. One big push: introducing lifetime-income options and...